os.bas added. don't know it's location.

Needs to handle and re-raise errors before merge.
Added supplementary/extraneous error handles

Really do not like the error handling pattern I am using.  It allows for future handling/bubbling of vb errors.
license
Update os.bas
Rename os.bas to core/os/os.bas
Create seq.bas

This is the general aux sequence processing file.  Many parts should be split into separate file.  Ckuhn's Enumerable is duplicated here.
Create List.cls
Update List.cls
Create TypedList.cls
Create SortedList.cls
Added not sequence error
Updated error message
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Merge pull request #4 from ptwales/master

os.bas