• config: all macros are defined as 1 / 0. testing with #if allows compiler warnings (testing undefined macro) to spot misspelled macros
• debug: add provision for naming threads. allows adding current thread name to log messages and displays their names in the debugger.
• replaced various if(err < 0) complain() sequences with new variants of CHECK_ERR (see lib.h)
• fixes to mmgr/VC debug alloc enable code
• improved h_mgr error reporting (now complains when h_free fails)
• US -> UK english (partial)
• fix tex_load double-free bug
• move win32 mouse cursor code into sysdep
• error dialog is now topmost to make sure it's visible (was a problem)
• handle WM_QUIT before displaying error dialog (makes sure it's shown)

also as in previous 3 revisions.