Adds bugfixes and maintenance for avrftdi

Bugfixes:
-remove ftdi_usb_purge_buffers(), since it does not flush, but clear buffers
-fix bad polling in avrftdi_flash_write() where it was possible to poll a 0xff
 value. 

Maintenance:
-use #defines from libftdi for MPSSE commands where applicable
-reformat E() and E_VOID() macros
-remove TYPE_* macros
-clean up private structure (remove pin_inversion, type and ftype)
-adds ftdi_pin_name() to turn a (FTDI) pin number to a human readable string
-adds avrftdi_print to encapsulate "if(verbose > c) fprintf()"-idiom
-nicer / better understandable (I hope) output
-removes pin_limit() and adds a member in the private data structure.
 TYPE_* macros can be removed; decision is made from (struct ftdi_context).type
-add_pin(s)() functions reworked. parameters are validated first, if everything 
 is alright, pin_value is modified. pin_inversion mask is not needed; use
 PIN_INVERTED instead
-change set_pin(s)(), so that it gets the pin value used by avrdude (and not a
 bit mask). This way, PIN_INVERTED is usable and pin_inversion is not needed.
 Plus, the interface is consistent with the add_pin() signature. Also move
 parameter validation to the start of the function. I also commented out the
 warning, that a pin is not defined, because it is annoying.
-clean up avrftdi_open(): first parameter validation, then USB lookup, interface
 initialization then pin setup
-avrftdi_eeprom_read/write() and avrftdi_flash_read/write(): convert to new
 calling scheme, where every paged_* function is called once for every page



git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@1098 81a1dc3b-b13d-400b-aceb-764788c761c2

ChangeLog

@@ -1,3 +1,8 @@
+2012-07-29  Hannes Weisbach <hannes_weisbach@gmx.net>
+
+	* avrftdi.c: bugfixes (synchronisation) and maintenance (paged programming,
+	nicer output, separation of parameter checking and actual code)
+
 2012-07-25  Joerg Wunsch <j.gnu@uriah.heep.sax.de>
 
 	* jtagmkII.c (jtagmkII_memtype): return MTYPE_FLASH rather than