renamed TWI to i2c, nobody knows what TWI is.

git-svn-id: svn://svn.code.sf.net/p/amforth/code/trunk@1630 fd1c0b69-5d68-47f5-910c-86182ebb6ecd
Single byte access to serial i2c eeprom

git-svn-id: svn://svn.code.sf.net/p/amforth/code/trunk@1631 fd1c0b69-5d68-47f5-910c-86182ebb6ecd
Merge branch 'hq'