add TopHat baseline estimation
add TopHat manual page
add TopHat baseline estimation test
show correct argument name in .stopIfNotMass{Object,Spectrum,Peaks}List
add iplot methods
add movingAverage to example
update NEWS file and increase version number
Merge branch 'tophat'; closes #6
add internal iplot functions
add iplot to NAMESPACE
fix "argument peaks missing with no defaults"
add iplot documentation
update NEWS and increase version number
Merge branch 'iplot'; closes #7