bug #40142 Floating point exception on Ubuntu 10.04
* avr.c: avoid division by zero in report_progress(), eg. when 
  writing an empty eeprom file were total becomes 0

git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@1340 81a1dc3b-b13d-400b-aceb-764788c761c2
ser_posix: added support for faster baudrates than 230400 on posix based systems
butterfly: implemented a variabel timeout for the erase call in the avr109 protocol. Needed to support AVRs with more than 128kB programm memory.
Added extended parameter to ft245r to select device by ftdi serial number