Removed the interrupt based transmit.

It turned out that sending data on a simple poll is as good as an interrupt
based sending. But it is smaller.


git-svn-id: svn://svn.code.sf.net/p/amforth/code/trunk@1609 fd1c0b69-5d68-47f5-910c-86182ebb6ecd
Some string functions.

They work with RAM based strings only.


git-svn-id: svn://svn.code.sf.net/p/amforth/code/trunk@1610 fd1c0b69-5d68-47f5-910c-86182ebb6ecd
removed duplicate label, segment boundary check at compile time added

git-svn-id: svn://svn.code.sf.net/p/amforth/code/trunk@1611 fd1c0b69-5d68-47f5-910c-86182ebb6ecd
correctly calculate free stack space.

git-svn-id: svn://svn.code.sf.net/p/amforth/code/trunk@1612 fd1c0b69-5d68-47f5-910c-86182ebb6ecd
relocate usart interrupt words.

similiar to 1wire.


git-svn-id: svn://svn.code.sf.net/p/amforth/code/trunk@1613 fd1c0b69-5d68-47f5-910c-86182ebb6ecd
remove not from core word sets.

maybe be included via application dict file or better replaced with 0= 


git-svn-id: svn://svn.code.sf.net/p/amforth/code/trunk@1614 fd1c0b69-5d68-47f5-910c-86182ebb6ecd
Merge branch 'hq'

Conflicts:
	core/amforth.asm
	core/drivers/usart-isr-rx.asm
	core/drivers/usart-isr-tx.asm
	core/words/usart-rx-isr.asm
	core/words/usart-tx-isr.asm