extractFeatsPALMSDir: Extract GPS features from a PALMS directory
In kkatellis/TLBC: Two-level Behavior Classification

Function to extract GPS features from a directory containing PALMS-filtered GPS data files.

1	extractFeatsPALMSDir(inputDir, outputDir, winSize, names=NULL)

`inputDir`	Path to a directory containing PALMS-filtered GPS data files. Each file should be a csv file with the following fields: identifier, dateTime, speed, distance, duration, ele, elevationDelta, lat, lon, nsatUsed, nsatView, snrUsed, snrView, fixType.
`outputDir`	Path to a directory to save computed features. A separate directory for each input file will be created containing features for each day.
`winSize`	Window size in seconds.
`names`	(Optional) If provided, compute features only for filenames in this list.