MSVC projects updated
1) add property sheet LocalDefs.vsprops to define local environment symbols for all projects. Can be edited in MSVC to suit your system. Only one there now is WXWIDGETS_HOME.
2) exclude PTAinterpolate from builds, as it references writeProject() in ptpicker.c, which is already excluded from libpano.
3) correct puntuation in the linker properties for PTuncrop.