Fix spelling issue as reported by Debian's lintian tool:
accomodate -> accommodate
addtional -> additional
auxillary -> auxiliary
bellow -> below
betweeen -> between
Calulate -> Calculate
coefficents -> coefficients
Defalt -> Default
defaul -> default
higer -> higher
neccesary -> necessary
orignal -> original
ouput -> output
precison -> precision
processsing -> processing
substract -> subtract
Transfered -> Transferred
upto -> up to

Also add several of them to the 'common typos' check in patcheck.
Signed-off-by: Diederik de Haas <didi.debian@cknow.org>