- Fix the way the start command parses its arguments. Previously, the arguments were...

- Fix the way the start command parses its arguments. Previously, the arguments were split up using split() and then the parts intended for the program were recombined, but this is wrong because it cannot preserve quotes. Changed cmd_start to do tokenization itself instead.
- Implement "title", /Ddirectory, /MIN, /MAX, and /WAIT options.
- Remove 'first' variable which only ever contained the name of "start" itself - all the places where it was used appear to be mistakes; replaced with 'rest'.
- Fix crash that happened when attempting to start a file with no extension.

svn path=/trunk/; revision=35248