Fixed device pointers in mirror scanning script.
Changed alignment stepping position.
Fixed numerical length of coordinates sent to stage to no greater than stage resolution. This solves a serial read/write error when the position being sent is too precise a number.
Merge branch 'development' of github.com:emmpbee/itop into development

Mirror scan script and stage io error updated locally merged with remote prism testing and pep 8 updates.
Fixed missing parentheses syntax error
Improved prism angle testing beam position starting values to eliminate need to scan for beam again if beam not located at position of first guess.