PCSI changes to support arch-specific EXE directories

This references issue #57.
System startup procedure stuff to handle multiple architectures.

This references issue #57.
Fix some silly typos missed when creating this procedure.
Changed to call MMK___STARTUP.COM.
No longer bother with parameters.
Add MMK___STARTUP.COM.
Merge branch 'master' of github.com:endlesssoftware/mmk into issue-57
Correct mis-named directory.
Add MMK___STARTUP.COM to the VMSINSTAL 'A' kti.
Fixed DCL typo.

Instllation testing revealed a lack or parenthesis in a DCL IF test
experession.
Add MMK___STARTUP.COM to VMSINSTAL kits.

I had to reorganise the commands that built the .A kit as there were too
many characters i nthe command line.
Correct a mistake in the naming convention.
Testing found an oversight in the installation procedure.
Changed to base default install directory on MMK_ROOT.
Couple more forgetful typos.  I think I might need some sleep...:-(
Final change to VMSINSTAL installation procedure to support architecture
specific installation directories.

This fixes #57.
Merge pull request #62 from endlesssoftware/issue-57

Changes to support architecture specific installation directories.