Merge pull request #6 from cameronbracken/master

Add units to data.table output
No need to call initialize.dssrip()

Also added some more work towards using .jpackage to allow existing JVM
to be used.
Another stab at quieting DSS messages
Documentation updates
Documentation updates
Use options("dss_location") to specify default dss_location.  If this
this is not yet set (returns null), use default DSSVue install location.
Fixes issue from latest Java update.  Allows user to set which DSS-Vue
install they want to use and which JRE to use.
Added hydrotools.R

hydrotools.R contains functions and constants for:
- acre-feet to cfs-day conversion
- simple water year date manipulation
- error functions common to water resources:
a) excelR2 - not recommended, analog to excel's R2 measure
b) RMSE
c) nash sutcliffe model coefficient with alternative model
- Common plot breaks for flow-frequency curves:
a) flowBreaks for log10 scaled axes
b) probBreaks for 'normal probability' axis
Merge branch 'master' of https://github.com/eheisman/DSS-Rip
Revert java changes accidentally committed.

Oy.
Yet another reversion.
Fix change made before uploading

Note to self: test all code.
minor bug fixes
Quiet load process
Added 'as.percent' to probBreaks to save space
Fix DESC and probBreaks ordering

Changed probBreaks to generate 'inverted' probabilities by default.
Follow best practices with startup messages.
Can show return period, two methods for ties.
xts objects now contain metadata

Copy metadata from TSC to XTS

Note: getFullTSC (from XTS) may overwrite metadata, so it is advised to
use getTSC if you care about metadata that may vary between individual
(not date-aggregated) records.
Simplified getPaths and added test data.

Simplified getPaths function with auto-detect for the search function.

Added sample data to test.dss from USGS.