[gimp] (35 commits) Non-fast-forward update to branch wip/nielsdg/va-marshaller

[Michael Natterer <mitch src gnome org>]

The branch 'wip/nielsdg/va-marshaller' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  e8ef4ed... app/core: Use NULL for "simple" signals

Commits added to the branch:

  450a9f9... libgimp: add a GimpPDB class and subclass GimpProcedure as  (*)
  05baadc... pdb: rename the "procedural_db" PDB group to just "pdb" (*)
  468276e... pdb: remove the section docs from unit.pdb (*)
  4d74452... fix gtk version (*)
  61c11b0... m4macros: Windows may have a versioned directory for header (*)
  d8640d5... plug-ins: port procedure-browser to GimpPlugIn (*)
  dc8f9dd... plug-ins: add interactive run mode for palette-offset. (*)
  079027f... m4macros: fix python3dev. (*)
  bfda31a... configure: fix the Python checks. (*)
  8860d78... libgimp: more progress on the GimpPDB object (*)
  84cb07f... libgimp: add more comfortable ways to run procedures to Gim (*)
  d6d987e... plug-ins: port plugin-browser to GimpPlugIn (*)
  b20aab0... libgimp: add annotations to gimp_pdb_run_procedure_array(). (*)
  c65b507... Update Russian translation (*)
  9a02714... libgimp: add read- and write-channel construct properties t (*)
  c2e5374... pdb, libgimp: make all PDB wrappers use GimpPDB to run proc (*)
  caa61ee... libgimp, pdb: remove gimp_run_procedure_with_array() from g (*)
  3c001a6... libgimp: separate legacy from GimpPlugIn wire communication (*)
  cc5e924... libgmp: move the remaining legacy code to gimplegacy, even  (*)
  f16ad87... plug-ins: add .gitignore files. (*)
  3a943f4... po-python, po-script-fu: update for new python plug-ins (*)
  500a840... libgimp: forgot to add gimplegacy-private.h (*)
  877a116... libgimp: fix typo in G_OS_WIN32 code (*)
  fc33489... plug-ins: move goat-exercise to a goat-exercises/ directory (*)
  2599c6e... libgimp: add some const to input parameters, like const Gim (*)
  64d880f... libgimp: add gimp_pdb_temp_procedure_name() and hide the PD (*)
  7b58cb1... libgimp: move most old gimp_pdb functions to gimplegacy.[ch (*)
  6b17c94... plug-ins: adding a hello-world plug-in in javascript. (*)
  1e6abab... libgimp: name parameters "procedure_name" not just "name" (*)
  0ef65bc... pdb: move gimp_plugin_set,get_pdb_error_handler() to gimple (*)
  fc620ee... libgimp: read and write channel should be boxed properties. (*)
  6ed3b48... plug-ins: goat-exercise improved to show a dialog. (*)
  e608297... Issue #3718 - Large colorrc file causes lag when painting w (*)
  07b7d63... app: limit color-history palette size (*)
  39e4aa3... app/core: Use NULL for "simple" signals

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