Change block size to 512 bytes.

Still not 1024 as ANS94 says, but fits smaller Atmega RAM

git-svn-id: svn://svn.code.sf.net/p/amforth/code/trunk@1641 fd1c0b69-5d68-47f5-910c-86182ebb6ecd
The offical tester has changed to t{ .. }t

git-svn-id: svn://svn.code.sf.net/p/amforth/code/trunk@1642 fd1c0b69-5d68-47f5-910c-86182ebb6ecd
Conditionally Interpreting a line of code

git-svn-id: svn://svn.code.sf.net/p/amforth/code/trunk@1643 fd1c0b69-5d68-47f5-910c-86182ebb6ecd
I2C devices in depth recipes and code examples

git-svn-id: svn://svn.code.sf.net/p/amforth/code/trunk@1644 fd1c0b69-5d68-47f5-910c-86182ebb6ecd
Merge branch 'hq'