mega65-user-guide

added new attach documentation, deprecated old d81attach and d81detach

New raw mode for BASIC BSAVE; new SAVEFL KERNAL call that can do raw mode

Fix VSYNC max range for NTSC, it's actually <= 261.

DIR U12 now supports a pattern string.

Document new CHAR address range. Improve explanations of charsets for CHAR and CHARDEF.