CodeSnip Old Code (SVN)

This merges ability to conditionally compile portable edition to main code base. Code is based on that used for Release 4.0.1 portable beta 1.

Root directory and ChangeLog-v3.txt have changes only to svn@... property.

Other significant changes:
* Support for PORTABLE symbol used to conditionally compile portable edition when defined and standard edition when not.
* Documentation updates re addition of portable edition.
* Version info and program ids differ between editions.