Moved location of avrdude and avrdude.conf for 1.5.8 on Linux (only!)

Subject to change during the beta phase, as its already different
than 1.5.6, also may change when packaged for Debian (usually symlinked)

Fixes issue #301
Merge pull request #302 from sej7278/master

Moved location of avrdude and avrdude.conf for 1.5.8 on Linux (only!)