* app/core/gimpchannel-select.[ch]: add push_undo arguments
	to several gimp_channel_select_foo functions.

	* app/actions/vectors-commands.c
	* app/core/gimpchannel-select.c
	* app/core/gimpchannel-select.h
	* app/pdb/paths_cmds.c
	* app/pdb/selection_tools_cmds.c
	* app/pdb/vectors_cmds.c
	* app/tools/gimpellipseselecttool.c
	* app/tools/gimpfreeselecttool.c
	* app/tools/gimprectangleselecttool.c
	* app/tools/gimpvectortool.c
	* tools/pdbgen/pdb/paths.pdb
	* tools/pdbgen/pdb/selection_tools.pdb
	* tools/pdbgen/pdb/vectors.pdb:  add push_undo argument
	to function calls where needed.