Log Message:
Updated package to latest version, 1.5; also updated package to work with
ocaml.mk structure and changed upstream to github.

Changes:
version 1.5
* Improve various commands of csvtool avoiding loading the whole CSV file to memory.
* As a consequence, one avoids some Stack_overflow exceptions for long files.

version 1.4.2
* Add the possibility to specify an output format to csvtool.

version 1.4.1
* Fix writing bug when excel_tricks is enabled.

version 1.4
* Optional discarding of spaces
* Special handling of files with a header