[USERENV]

[USERENV]
- Use a better variable type for the 'Environment' parameter of SetUserEnvironmentVariable, AppendUserEnvironmentVariable, SetUserEnvironment, SetSystemEnvironment, so as to avoid useless casts.
- Add old-style parameter annotations for exported functions (at least);
- Add an implementation comment about setting HOMEDRIVE/HOMEPATH;
- Use ARRAYSIZE() instead of hardcoded buffer sizes;
- Don't say that GetShortPathNameW() failed when it succeeds;
- Use standard capitalization for hardcoded environment variables.

svn path=/trunk/; revision=73440