update to v2.0.3

- Add new functions 'test_lognorm' and 'qq_plot' to test lognormality
- Bug correction (issue#13)
- Now the maximum precision of the kde estimator can be declared
- Incremental improvements in the code (Including some reorganization)
- Incremental improvements in the plots
- Requiremets list updated

update website

changes to v2.0.1

minor issues new release

fix error in a plot

- other cosmetic changes

update doc to release v1.4.4

ready for v1.4.3

incremental improvements (mostly cosmetic)

all matplotlib code is now in oop style

added some figures for future improvements in website and docs

update script to v1.4.2

update to v1.4.1

calcite piezometer (Rutter, 1995) added

release v1.4

changes in documentation and script