Java-only stuff

Various generally useful utilities

Read and write CSV/TSV. Portable: the parser and writer are plain Clojure operating on
strings and vectors, so they work identically in Clojure and ClojureScript. Clojure also
gets convenience fns for reading from files, classpath resources, and urls (anything
clojure.java.io/reader accepts), and for writing to files.

Two shapes in and out:
 - raw: a seq of rows, each row a vector of string fields (first row usually a header).
   Always plain strings, untouched.
 - ms (mapseq): a seq of maps, keyed from the header row -- see hyperphor.multitool.data.
   Values are lightly coerced (empty field -> nil, otherwise numeric strings -> numbers)
   since that's almost always what you want out of a mapseq; pass :strings? true to keep
   everything as strings.

Synthesized from the various copies of this floating around (voracious, traverse):
numeric coercion, :__id for a blank header, and BOM-stripping on file reads all came from
there. Their :quote? auto-quote-numeric-looking-strings-on-write trick was dropped -- it
was marked broken in both sources and rows->str's ordinary auto-quoting covers real needs.

Utility functions for development only