[REF] resource: strengthen link between companies and calendars

Purpose of this commit is to always have a default calendar for each
company and ensure it is correctly set on resources.

Some cleaning is also performed in resource models to remove unused
fields, improve labels and make views a bit more odoo-ish.

 * [REF] res_company: add a m2o to the default calendar to use in the
   company as well as a o2m linking all resource calendars used in the
   company. Some code has been added to correctly update existing
   companies when installing the module;
 * [REF] resource_calendar
  * [REM] manager field on resource.calendar: this field is never used
    and is not necessary anyway
  * [ADD] global_leave_ids: filter leaves on a calendar to see global
    company leaves
  * [IMP] better default company / calendar computation to ensure there
    is always a calendar attached to a resource
  * [IMP] improve resource and calendar views in order to look more like
    other odoo views

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