add: ramdrive.h ...

chg: renamed device_t.size to sectors
chg: made #define for size of ramdisk
chg: calculated sectors of ramdisk and stored in the device_t struct

chg: modified UbixFS::vfs_format() to properly init the device ...

chg: modified UbixFS::vfs_init() to verify that it's a ubixfs partition
add: added BAT blockRun in the superBlock

add: device.h, types.h. Temporarily moved custom ubix typedefs to types.h ...

(<ubixos/types.h> supercedes this file when this code is included into
     the kernel)
chg: changed dev_t to device_interface so as to not conflict with bsd/linux
     definitions
chg: fixed up compiler warnings in btree.cpp