Use PANDAS more

[jradavenport]

• remove all np.loadtxt and use pd.load_table if possible
• convert all OLD style pd.rolling_ to the new rolling API (which I dislike, but oh well) - this is particularly for rolling_std, but maybe rolling_median would be useful for a first filtering step...

@ekaterinailin are there other places we can/should use Pandas to do data handling and filtering?

[ekaterinailin]

The pd.rolling part is done in this pull request.
np.loadtxt is partly removed, except the UW database data load function.

[jradavenport]

We can remove GetLCdb function entirely, as that database is basically dead anyhow!

Do you want to do this in your upcoming PR, rather than me mucking with the master?

[ekaterinailin]

Do you want to do this in your upcoming PR, rather than me mucking with the master?

Yes, will do!