small changes to metab.xx() output format, metab()
Merge pull request #35 from jread-usgs/master

Funky things going on with Rd files being removed. Committing w/o \code{param}
using datetime not date in addNAs, attributes in metab, other
Merge branch 'master' of https://github.com/GLEON/LakeMetabolizer
merging jread pushes with local and remote (local up to date)
fixed ; in ss.sr, adjusting bk, error in ss.sr
fixed metab.bookkeep

fixed argument order for is.day (datetime and lat had been reversed, so i switched the order in which they were supplied in metab.bookkeep and used argument names). Also, fixed the use of lake.lat and datetime arguments passed through ... (pulled them from list instead of expecting them to be in environment)
removed extra printing/ comments, added Mode()
added freq, checks to metab.bookkeep, clarified addNAs
added freq to metab.ols; commented metab; rearranging addNAs
enhanced addNAs so that user no longer *needs* (but can) supply a year and/or doy column to metab()
added freq to ols; converted k.gas in passing to optim()
scaling up gpp & r to daily using freq instead of nobs in ols and mle
changed mle2NLL to mleNLL (was relic of when there were R & C versions; deleted comments
added freq to metab.kalman
divided by /freq in kalman, added freq to bayes
had to remove ... from call to optim() in metab.kalman and metab.mle
minor adjustment
added wtr=wtr argument to metab()
fixed bug where round.time() would always convert to POSIXct
fixed unintended behavior in round.time where output always converted to character (instead of POSIXct)