Added GPS mode

By adding a config for GPS mode you can set how trustworthy a location must be before you use it
mode 1 , no GPS log working form memmory
mode 2 is good for a spot on the face of the earth
mode 3 lets you know your hight as well !
Added Make system

Using 'make' and make 'cleandb' the setup of GPSlogger will become much easer
Added 'make help' to assist with use of make
Added DB name to config (only fir use in gpsmakedb.py at this time)
Merge branch 'GPSmode'

Conflicts:
	config.py