REddyProc 1.3.3

• Fixed bug in plotting daily sums, where default scale (gC / day) was of by
  a factor nRecInDays.
• Plotting daily sums: Uncertainty computation conservatively assumes fully
  correlated errors rather than fully independent errors
• Provide argument isSplitDatetime to fWriteDataframeToFile to write files
  consistent with the REddyProc web tool.
• Implement experimental version of Vekuri23 lookup-table variant of gapfilling
• test breakpoint in Barr13 by more powerful pscore.test (Muggeo 2016)
• include mlegp dependency again - its on CRAN again