Bind 'Cut', 'PrevWord', and 'NextWord' for more menus

Original nano commit: 5021
http://svn.savannah.gnu.org/viewvc?view=rev&root=nano&revision=5021
Original nano commit message:
	Adding default keybindings for Cut, PrevWord and NextWord in the prompt input lines.
When binding keys, only allow menus where the function is present

Original nano commit: 5022
http://svn.savannah.gnu.org/viewvc?view=rev&root=nano&revision=5022
Original nano commit message:
	Allowing only those menus where the bound function is actually present,
	when rebinding keys.
Update man page for the meaning of the "all" keyword for binding/unbinding keys

Original nano commit: 5023
http://svn.savannah.gnu.org/viewvc?view=rev&root=nano&revision=5023
Original nano commit message:
	Updating the docs for the narrower meaning of 'all' when rebinding keys.
Remove the ability to search for matching brackets in the statusbar

Original nano commit: 5024
http://svn.savannah.gnu.org/viewvc?view=rev&root=nano&revision=5024
Original nano commit message:
	Removing the ability to search for a matching bracket in a prompt input line.
Remove non-existent 'BUGS' file from the pinot.spec file
Remove unneeded 'have_shortcut' and 'allow_funcs' parameters from do_statusbar_input()

Original nano commit: 5028
http://svn.savannah.gnu.org/viewvc?view=rev&root=nano&revision=5028
Original nano commit message:
	Removing the useless parameters 'have_shortcut and 'allow_funcs'.
Remove 'execute' flag for shortcut functions, handling the necessary exception (do_gotolinecolumn_void) as a special case

Original nano commit: 5029
http://svn.savannah.gnu.org/viewvc?view=rev&root=nano&revision=5029
Original nano commit message:
	Eradicating the execute flag -- it is almost always TRUE, and when it's FALSE
	then it's for a function that is an empty placeholder, so executing it will
	not do anything anyway.  Handling the one exception (do_gotolinecolumn_void)
	specially, just like the other one (do_cancel) already is.
When undoing a line deletion at the end of a file, update the pointer to the bottom of the file

Original nano commit: 5033
http://svn.savannah.gnu.org/viewvc?view=rev&root=nano&revision=5033
Original nano commit message:
	Updating the pointer to the bottom of the file
	when undoing line deletions at file's end.
	Patch by Mark Majeres.