[libgda] (11 commits) ...Merge branch '1-evaluate-the-deprecation-of-gdatimestamp'

[Daniel Espinosa Ortiz <despinosa src gnome org>]

Summary of changes:

  fcbf042... GdaTimestamp: Initial porting to GDateTime (*)
  e12a93d... GdaTimestamp: removed setters making it readonly (*)
  1524523... GdaTimestamp: Removed unused _GdaTimestamp struct definitio (*)
  2232884... GdaSet: using g_type_is_a() for type checking (*)
  3b643dd... GdaTimestamp: Replaced with GDateTime: Step 1 (*)
  9cff4b4... Gda Util: Fixed _parse_iso8601_time() for time zone parsing (*)
  a4bf056... GDA Time parsing fixed porting GdaTimestamp to GDateTime (*)
  e96923e... Fixed unit tests for rendering GdaTimestamp (now GDateTime) (*)
  320985b... Removed GdaTimestamp API in favor of GDateTime's one (*)
  f3d7020... Fixed Unit Test for GDateTime port of GdaTimestamp (*)
  f578d9f... Merge branch '1-evaluate-the-deprecation-of-gdatimestamp'

(*) This commit already existed in another branch; no separate mail sent