Use VERSION file to generate version string
simplify interface to back end
remove debug printf
fix license
Merge pull request #1471 from WalterBright/b5

simplify interface to back end
Merge pull request #1469 from 9rnsr/vergen

Use VERSION file to generate version string
add version.c to manifest
Merge pull request #1472 from WalterBright/b6

Add vergen.c to win32.mak
Add vergen.c to posix.mak
Merge pull request #1473 from 9rnsr/b6

Add vergen.c into posix.mak