Merge pull request #1 from peterl94/libpack

Libpack
fix recursive delete
build tcl/tk
fix netgen build
netgen depends on zlib
fix f2c build
fix tab in .diff file
factor tmp_install
version formatting
save cwd/environ
fix builds
use vcupgrade instead of devenv for project upgrades
add upgrade_vcproj
use formula-dependent temp_install directories (for parallel build)
Replace tabs with spaces
Merge pull request #2 from mdinger/typos

Replace tabs with spaces