The NPM folder is personal to the user. It shouldn't be added to the
system-wide path.

- Fix: it didn't work for the x86 version of node
- Also add NPM to path
- Also print node version
- Don't change dir to home dir if not started from the start menu

Closes #3507.

Exported from WP and cleaned up a bit.

Closes #3416
Closes #3477

There is no need for fs.readFile() to be using pread rather than read.
The default semantics of read() are such that subsequent reads are where
we want them anyway.

On Windows, full pathnames are stored in the Error object when
a file i/o error happens. This is not the case on Unix. Before
this fix the test would break because of these full paths.