Re-introduce tmpdir() and homedir(), update chdir()
Re-introduce tmpdir() and homedir(), update chdir()

The original idea behind unifying them into a single chdir() usage, becomes
very cumbersome in the implementation.  Therefore we're going back to these
functions.

perl6/specs,perl6/specs,tokuhirom/specs,prammer/specs,tokuhirom/specs,prammer/specs,prammer/specs,tokuhirom/specs