Various fixes.
- Replace hardcoded INDEX version. [1]
- Fix a buffer overlap. [2]
- Remove empty package when fetching fails and -K is used. [3]
- Remove useless chmod2() after mkdtemp(3). [4]
- Replace mkdir(1) call with mkdir(2). [5]
- Get rid of some vsystem() calls.
- Switch from lstat(2) to open(2) in fexists().
- Try rename(2) in move_file() first.
- Bump PKG_INSTALL_VERSION to 20100401.
PR: bin/145101 [1], bin/139492 [2], bin/144919 [3]
bin/144920 [4], bin/144921 [5]
Submitted by: gcooper [1,2,3,4,5]
348853b7ae