[ITS people2] Implemented people2 filter for ITS using single group by people queries.
[MLS people2] Implemented people2 filter for MLS using single group by people queries.
[scm metrics] Remove old sql builder in Commits class
[query builder] Refactor GetSQLxxxFrom in SCM methods to use self.identities_db
instead of passing the parameter to the method
[mls] Refactor MLS query builders to use the attribute self.identities_db
instead of using the parameter from the method.
[mls] Fix minor errors in mls metrics
[its] Refactor ITS query builders to use the attribute self.identities_db
    instead of using the parameter from the method.
[scr] Refactor SCR query builders to use the attribute self.identities_db
        instead of using the parameter from the method.
[irc] Remove wrong method calls to GetSQLReportFrom
* [SCR] Removed repositories metric from filters metrics. repositories of repositories give an error.
* [tests] Updated SCR json files to remove repositories metric.

Merge branch 'master' of github.com:VizGrimoire/GrimoireLib

Conflicts:
	vizgrimoire/metrics/query_builder.py
* [SCR] Removed repositories metric from filters metrics. repositories of repositories give an error.
* [tests] Updated SCR json files to remove repositories metric.
* Removed identities_db param from several places.
Round all decimales in metrics to Metrics.max_decimals.
Updated JSON with decimals now rounded to 4 max.
[utils] Force the label creation to use en_US.UTF-8 locale
First try at querying TZ for the authors data in SCM.
Some cleanup and code to filter out some developers.
Added create_report for Ages object. Seems to work with report_tool.py.
Ages_ITS now has its own report generator (but I canot make automator to call it).
Aging analysis now seems to work pretty well both with ITS and SCM.
Some clean-up and minor modifications.