v0.9.0

Functionality additions mostly related to the development of the BIDS app, and some long-overdue convenience functions.

• In linear models with a tstarIncludedFrames parameter, this is being deprecated in favour of two new arguments called tstar and tstar_type. This allows specifying tstar either as the number of included frames from the end, or else as a number of minutes after which pseudo-equilibrium has been achieved. This is much simpler for datasets with different sets of frame times.
• In all models, specifying subsets of frames to be included is modelling is simpler as there is a timeStartEnd and frameStartEnd argument to decide upon
• The plyr dependencies have finally been expunged from the package and replaced with dplyr
• The package has been updated so that it no longer raises warnings with the CRAN checks. It might soon be time to submit to CRAN.
• Weighting functions and decay correction allow custom half-life times for different radionuclides other than C11, O15 and F18

Next release probably to be expected reasonably soon as more things are added to the functions to allow the BIDS app to function.