client: Build Mac client as an x86_64 application rather than 32-bit, for compatibility with CUDA version 6.5 drivers.  BOINC for the Mac now requires a 64-bit Intel Mac running at least OS 10.5.

MGR: Set background color according to skin in Simple View dialogs; this is a slight cosmetic tweak for checkboxes on Windows 7, which have a narrow border using the background color at their bottom and right side; also don't use magenta background color for debugging backgrounds unless specifically requested by setting a new define TEST_BACKGROUND_WITH_MAGENTA_FILL to non-zero.

Aargh!  My checkin of 31 Aug 2011 causes the client to strip the trailing \n
from the code-signing key; this change affects 7.0+ clients.
This broke the documented protocol for changing code-signing keys,
since signatures for the new key with the trailing \n won't work.

Solution: when you change code-signing key,
you have to sign both the stripped and non-stripped versions
of the new public key.
See http://boinc.berkeley.edu/trac/wiki/CodeSigning

This required a change to the scheduler so that it sends
one signature or the other based on client version
(stripped for 7.0+, else unstripped).
This change is entirely within send_code_sign_key(),
in case you want to update just that.

WINBUILD: We must set wxDEBUG_LEVEL=0 in Manager preprocessor definitions for release builds, otherwise __WXDEBUG__ is defined because the Manager includes wxwidgets\include\wx\debug.h.  This caused the magenta artifact around the checkbox in the Simple View preferences dialog, and possibly other issues.

BUILD: Remove static references to GTK 2.x components, use package config properly. (From Steffen Moeller)

This was causing unneeded reboots on upgrades of service mode installs.

Reported by Bill Flynn; may be due to Python changes

MGR: On MS Windows, adjust sizes of images in Advanced Frame tabs and Computing Preferences tabs for users DPI setting.

MGR: Make sure the various item property dialogs open up in the designated client area on Windows and Mac.

BUILD: Remove references to the XSS libraries.  The X11 screensaver in clientscr depends on the XCB and XCB-ATOM dev packages.  BOINC API just depends on glut and glu.

This would also cover digitizers and bluetooth devices.