otawa: parse persistence flags from string (data_fmlevel_t)
patmos: reorganize steps for data cache analysis

* follow instructions from dcache.cpp
* enable persistence analysis
* enable may analysis
patmos: update memory banks

* accesses to local memory are now uncached
* remove bank representing the local memory
* extend DRAM bank to maximum (not 0xffffffff for some reason?!?)
update gitignore