#156 API calls that fail are not reported to user

[April White]

Using SciTE v1.57, under Microsoft Windows XP [Version
5.1.2600], gcc version 3.2.3 (mingw special 20030504-1)

OpenDialog() calls Win32 GetOpenFileName(), but does
not report to the user if the API call fails. If the last
error value is none zero, the value itself and
CommDlgExtendedError() should be reported.

[Neil Hodgson]

Logged In: YES
user_id=12579

I don't think this is worth doing as the return on effort is
too small. The information will not often be of interest to
the user.

[Neil Hodgson]

Common dialog failures checked and reported in [6801e5].