Fixes/changes:

DOG

Fixed init + mkudata (for env and alias blocks).
Restored the old DOG prompt as the default when no PROMPT variable is set.
Now using Borland C++ 3.1 to build, and Make instead of the batch files in previous versions.
HH utilizes HELP.COM to display more thorough help texts, through the alias HHH. The example DOG.DOG file sets up the alias:
```
al hhh %DOGDIR%\bin\help.com
```
Updated the IF syntax to be more versatile and to be similar with do.
Implemented 44 and DO and IN and TI DOGFile commands.
Fixed the Control-C implementation. Now it asks the user if they want to abort the program.
Implemented a proper Critical Error handler.
Fixed environment initialization and management.
Default dog.dog is used to set up the basic environment, edit this to suit your needs.

CP: now takes more options: -i (interactive), -f (force)
VR: Fixed FreeDOS detection + print FD kernel string. Also added DOSbox detection.
LS: Added
- -w option to display a wide listing with no details
- -z to show human readable sizes.
RT: Is now built from the rm.c file in addition to RM.

HELP: Expanded help to fully document all commands and DOG itself. The manual.txt is built with HELP.
GENERR: is a silly utility which returns the error code given as arg 1. Used in testbat.dog to have predictable errorlevels.
TINT24: test utility for testing the critical error handler.