For clients that support WM_TAKE_FOCUS in their WM_PROTOCOLS property, send
a ClientMessage event.
I believe we redraw the border in too many cases; likely a leftover from
the cc->pwin days - don't redraw on every unhide, resize, and mouse
move/resize Expose event (note, all Expose events trigger a redraw
anyway).

Tested with some finicky X apps I could think of, though I'm sure others
will find more - if so, and they 'lose' the border, please report!
Using xu_btn_ungrab() buttons during client_leave doesn't work (error
BadValue) when the modifier is already AnyModifier .  Instead alter
xu_btn_ungrab() to ungrab AnyButton/AnyModifier and call it only when a
client is coming into focus in client_setactive(), instead of iterating
over ignore mods - matches how we handle key grabs.
revert 1.138 (WM_TAKE_FOCUS) for now
wrap key ungrab like btn ungrab, for it'll be used again
shuffle
A client_delete should behave differently depending on whether the
triggering event was unmap (with pending destroy) log destroy; we only
need to grab/ungrab the server lock, set WithdrawnState and
XRemoveFromSaveSet clients coming from an unmap event - doing so for
clients coming from destroy are already gone, hence we generate errors.
Initial commit
Ignore build droppings.
Initial working Linux build.

I've added GNUmakefile rather modify Makefile to simplify future
merges.  GNU Make prefers files named GNUmakefile to ones named
Makefile so no additional command line arguments are necessary
when building on Linux with GNU Make.
Add cvs-authors file used for initial import.

Be sure to copy this file to .git/cvs-authors before running
git-cvsimport.  When new users commit changes upstream this file
will need to be manually updated before running git-cvsimport.
Document recommended way to sync with upstream.
Sort cvs-authors by username.
Fix copy-pasto in user's last name.
Sync copyright header with upstream.
Sync with latest upstream changes.

Merge branch 'linux-port'