Stable version as basis for mods like PDP-13

• C-core: Add REL2 addressing mode (as replacement for wrong REL implementation)
• Asm: Fix RIP addressing bug (reported by DS)
• Asm: Add 'namespace' and 'global' keyword to enable local and global labels
• Docu: Updates

v2.3

Stable version as basis for mods like PDP-13

Convert to LuaRocks project

1.1-1

Convert to LuaRocks project