Small fixes to fun_hydrology

[cailadd90]

Small fixes that could be incorporated straight into master

• switched the last recoding of partial inundation (P) from P = 0 to P = 1 so that P is now included in quantifying event (i.e., P and F cases are now used to calulate inundation duration)
• in hydro.DurEvents() function, moved the na_omit() after summarise to avoid losing P cases that have associated NA values for currents and waves
• removed redundant columns at the end of get.hydrodynamics()
• hydro.MaxWoO() was using reframe(), however shiny wasn't loading the package. After switching to summary(), some warnings appeared. I've rewritten the function to avoid this, and make it easier to interpret what's being done
• added an na.omit() necessary to calculate hydro.PeakCurEventTide()

[cailadd90]

I will apply these fixes again in the new master.