Ye Ol' π Shack

* Implements most of the following BASIC dialects:
    OPTION VERSION DARTMOUTH        ' Dartmouth DTSS BASIC
    OPTION VERSION MARK-I           ' GE 265 Mainframe BASIC
    OPTION VERSION MARK-II          ' GE 435 Mainframe BASIC
    OPTION VERSION SYSTEM-360       ' IBM System/360 BASIC
    OPTION VERSION SYSTEM-370       ' IBM System/370 BASIC
    OPTION VERSION CBASIC-II        ' CBASIC-II for CP/M
    OPTION VERSION ECMA-55          ' ANSI Minimal BASIC
    OPTION VERSION HANDBOOK1        ' The BASIC Handbook, 1st Edition
    OPTION VERSION HANDBOOK2        ' The BASIC Handbook, 2nd Edition
    OPTION VERSION TRS-80           ' TRS-80 Model I/III/4 LBASIC
    OPTION VERSION BASIC-80         ' Microsoft BASIC-80 for Xenix
    OPTION VERSION ECMA-116         ' ANSI Full BASIC
 * from Howard Wulf, AF5NE