Various bug fixes and code style

Fix log axis, now use base 10 instead of natural logarithm
Also filter data equal to or less than 0
Fix variable reference to datasets in update_dataset_select
Add semicolon where it was missing
Add 'var' in sort functions, making the variables local scope
Make get_column accept url as argument instead of data and type
Add timepicker

This adds the option to select a specific time of day for the start and
end dates
Add slider component to jQuery UI (used by timepicker)
Reduce font size in datepicker (ui widget)
Fix making histogram

Fix a memory leak cause by giving strings as arguments to range()
The range function requires floats/int as arguments
range() is not 'fixed', it still requires int/floats as arguments
Add support for plotting multiple variables

Cycle scatter plot fill color when plotting multiple datasets
Make get_column column-first when getting multiple columns
Use:
[[x1, x2, x3, x4], [y1, y2, y3, y4]]
instead of:
[[x1, y1], [x2, y2], [x3, y3], [x4, y4]]
Add support for multiple arrays in y when zipping data
Fix downloading plot and settings plot settings
Add functions to easily enable and disable sets of radio buttons
Add function to create a list of variables in a dataset

Has two sets of radio buttons to select which to plot on x/y-axis
Radio sets now have an 'alt' attribute to indicate its counterpart
Vectorize make_javascript_timestamps
Fix sorting of strings that are values and vectorize histogram function

The data can now be multiple arrays of data
The overall minimum and maximum will be used for the bins
Instead of nbins, the bin edges can also be given as argument
Fixed the sorting in case data values are strings
Prevents sorting to result in this: ['1', '10', '11', '2', '23', '9']
Make zip_data work for multiple x arrays
Update the flot settings

fillColor is taken from the colors cycle if set to false
Move common points settings to flot_base
Show grid above the data
Separate x/y label setting functions
Update demo

Now shows the variable selection options
Get info about what to plot from the selected elements
Set plot settings
Update examples with full day of data
Change default target for variable lists
Update demo css