Fixes/changes:
1. Most commands are now external (standalone) programs. This
  will reduse the size of DOG.
2. Batchfiles are reasonably stable.
3. % is the variable char $ is the prompt and eh special char

New features:
1. Pipes (only one at the time for now)
2.  Environmental variables can now be used in 
	  a) batchfiles %0 - %9 for the batchfile parameters
	  b) commandline %0 - %9 for the params of the previous command.