Deprecate a bunch of figure factories

[nicolaskruchten]

These figure factories should probably be marked "deprecated" in the docstrings:

These have dedicated trace types now:

create_bullet(data[, markers, measures, …])
create_ohlc(open, high, low, close[, dates, …])
create_scatterplotmatrix(df[, index, …])
create_table(table_text[, colorscale, …])
create_violin(data[, data_header, …])
create_candlestick(open, high, low, close[, …])

These are basically best done using PX if possible:

create_2d_density(x, y[, colorscale, …])
create_distplot(hist_data, group_labels[, …])
create_facet_grid(df[, x, y, facet_row, …])

[emmanuelle]

Should I just modifiy the docstrings or should we completely deprecate the functions?

[nicolaskruchten]

Let's start by just modifying the docstrings... Right now some of them say "BETA" which is kind of the wrong impression IMO :P

[emmanuelle]

Addressed in #1921.