Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

 templates/oscar#	gelöscht:       searx/static/themes/oscar/fonts/glyphicons-halflings-regular.ttf

In the templates and the /config (JSON) the usage of the 'brand.*' name
space is replaced by 'searx.get_setting' function.

- new_issue_url          --> get_setting('brand.new_issue_url')
- brand.GIT_URL          --> get_setting('brand.git_url')
- brand.PUBLIC_INSTANCES --> get_setting('brand.public_instances')
- brand.DOCS_URL         --> get_setting('brand.docs_url')
- brand.ISSUE_URL        --> get_setting('brand.issue_url')
- brand.CONTACT_URL      --> get_setting('general.contact_url', '')

The macro 'new_issue' from searx/templates/*/messages/no_results.html
is now imported with context::

    {% from '__common__/new_issue.html' import new_issue with context %}

To get *public instances URL* from context's 'get_setting()' function::

    get_setting('brand.public_instances','')

Macro's prototype does no longer need the 'new_issue_url' argument and has been
changed to::

    macro new_issue(engine_name, engine_reliability)

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

- drop #main_stats selector in stats.less
- 'engine-score' exists before this PR.
- untabify searx/static/themes/__common__/less/stats.less

for details see comment at: https://github.com/searxng/searxng/pull/81/files/d93bec7638908cae64530727d4e1539ae10bd144..1204e4f07e932029d66b4674a3474918228459a6#r633571496

Suggested-by: @dalf in commit 1204e4f0
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

Replace oscar theme's *styles* (see below) by CSP compliant implementation in
``searx/static/themes/__common__/less/stats.less`` ::

    ./oscar/stats.html:29:  <th scope="col" style="width:20rem;">{{ th_sort('name', _("Engine name")) }}</th>
    ./oscar/stats.html:30:  <th scope="col" style="width:7rem; text-align: right;">{{ th_sort('score', _('Scores')) }}</th>
    ./oscar/stats.html:33:  <th scope="col" style="text-align: right;">{{ th_sort('reliability', _('Reliability')) }}</th>
    ./oscar/stats.html:38:  <td style="text-align: right;">
    ./oscar/stats.html:91:  <td style="text-align: right;"> {{ engine_reliabilities.get(engine_stat.name, {}).get('reliablity') }}</td>
    ./oscar/stats.html:109: <tbody style="padding-top: 1rem;">
    ./oscar/stats.html:112: <th scope="row" style="width: 10rem">{{ _('Exception') }}</th><td>{{ error.exception_classname }}</td>
    ./oscar/stats.html:114: <th scope="row" style="width: 10rem">{{ _('Message') }}</th><td>{{ error.log_message }}</td>
    ./oscar/stats.html:116: <th scope="row" style="width: 10rem">{{ _('Percentage') }}</th><td style="width: 10rem">{{ error.percentage }}</td>
    ./oscar/stats.html:121: <span style="border-right: 1px solid gray; padding: 0 1rem 0 0; margin: 0 0 0 0.5rem;">{{ param }}</span>
    ./oscar/stats.html:138: <th scope="col" style="width: 10rem">{{ _('Failed test') }}</th>

Reported-by: https://github.com/searxng/searxng/issues/57
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

Replace bar graph's *styles* (see below) by CSP compliant implementation in
``searx/static/themes/__common__/less/stats.less`` ::

    ./simple/stats.html:49: <span style="width: calc(max(2px, 100%*{{ (engine_stat.result_count / engine_stats.max_result_count )|round(3) }}))" class="stacked-bar-chart-serie1"></span>{{- "" -}}
    ./simple/stats.html:57: <span style="width: calc(max(2px, 100%*{{ (engine_stat.http / engine_stats.max_time )|round(3) }}))" class="stacked-bar-chart-serie1"></span>{{- "" -}}
    ./simple/stats.html:58: <span style="width: calc(100%*{{ engine_stat.processing / engine_stats.max_time |round(3) }})" class="stacked-bar-chart-serie2"></span>{{- "" -}}
    ./oscar/stats.html:50:  <span style="width: calc(max(2px, 100%*{{ (engine_stat.result_count / engine_stats.max_result_count )|round(3) }}))" class="stacked-bar-chart-serie1"></span>{{- "" -}}
    ./oscar/stats.html:58:  <span style="width: calc(max(2px, 100%*{{ (engine_stat.http / engine_stats.max_time )|round(3) }}))" class="stacked-bar-chart-serie1"></span>{{- "" -}}
    ./oscar/stats.html:59:  <span style="width: calc(100%*{{ engine_stat.processing / engine_stats.max_time |round(3) }})" class="stacked-bar-chart-serie2"></span>{{- "" -}}

Reported-by: https://github.com/searxng/searxng/issues/57
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

allow to submit a github issue including the technical details
(exceptions, errors, warning, checker result)