Do not fail bulk tracking request if individual request has an incorrect request parameter.

Fixes https://github.com/piwik/piwik-log-analytics/issues/96, do not fail bulk tracking request if individual request has an incorrect request parameter.

Improve date & time formats

fixed integration test: https://github.com/piwik/plugin-CustomAlerts/commit/eeaa41b2ac0aa559caf2ef7c1be3b893de69c795

https://github.com/piwik/plugin-CustomAlerts/commit/b073096f120efbbd7877a6ea3466e24ca9c80e3c

when PROCESS privilege not granted, Piwik should work

removed unused schema code that uses SHOW ENGINES which can fail when PROCESS not granted

Links to plugin details didn't work

fixes: popovers might clear page content

Fixes untranslated country names on visitor map

Remove NO_ENGINE_SUBSTITUTION mode to prevent error if InnoDB is not available

Update tests/travis submodule for: use --force to avoid random failure in travis when running git checkout.

- languages with splitted language codes (e.g. pt-br, zh-cn, ...) were not included in the pull request description
- added TranslatorName to dev language to avoid notices when using the TranslationManager API in development mode

[automatic translation update] Updated 349 strings in 5 languages (gl, vi, sq, de, it)

Caching id actions in general cache for faster segmented archive SQL queries

Added INI setting to configure maximum number of id actions to store in one cache entry + integration tests

Caching id actions in general cache - can be enabled via INI setting enable_segments_subquery_cache setting (disabled by default)

Add idSegments as SQL comment in segment archiving SQL