correct switch to it, depending on the value of the DisableDithering option.
- Replaced some functions with macros in WINGs (wmkpoint(), wmksize() and
wmkrange()). They're less expensive to call this way.
- Fixed a memleak in the info panel.
WMConnection code. do call by yourself wsyserrorwithcode() passing
WCErrorCode, whenever a call don't return the expected value, and
WCErrorCode > 0. If WCErrorCode==0 that is not an system error,
condition, so don't call wsyserrorwithcode() in that case.
- added some assertions where appropriate
