Pthelma

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We now use "h" instead of "H", and generally we use modern pandas time
step ("frequency") designations.

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Added package rocc (equivalent to rocc 3.0).

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This is a different pthelma from the old 0.14, which had been abandoned
in favor of a number of separate packages. However, maintaining all
these separate packages was too cumbersome and now we re-combine them
here.

The packages recombined in pthelma 1.0.0 are:
* htimeseries 8.0
* hspatial 4.1
* evaporation 2.0
* haggregate 3.1
* enhydris-api-client 4.0
* enhydris-cache 2.0