DOC: interpolate: fix ReST issues in interp1d docstring
DOC: interpolate: remove UnivariateSpline methods from the module docstring

Methods are available in the individual *Spline classes
DOC: correct/expand docstrings of *UnivariateSpline class methods.
ENH: Changed scipy.stats.describe output from datalen to nobs
Merge pull request #4195 from ev-br/docs_interp

improve the interpolate docs
Merge pull request #4199 from clarkfitzg/nobs

ENH: Changed scipy.stats.describe output from datalen to nobs
ENH: Add above_threshold_color option to dendrograms.
TST: Check dendrogram plot with alternate colors.
BLD: fix a number of Bento build warnings.

c_misc was first added to includes for all modules, not just when needed.

Also update .gitignore for missing generated _ellip_harm_2.h file.

[ci skip]
DOC: document scipy.optimize.RootResults attributes
Merge pull request #4202 from QuLogic/dendrogram-threshold-color

Dendrogram threshold color
Merge pull request #4207 from andyfaff/rootresults

DOC: document scipy.optimize.RootResults attributes
Merge pull request #4205 from rgommers/fix-cmisc-warnings

BLD: fix a number of Bento build warnings.
ENH: special: add inverse Box-Cox transform
GEN: special: run generate_ufuncs
MAINT: stats: use inv_boxcox in genpareto
Merge pull request #4211 from ev-br/inv_bcx

add an ufunc for the inverse Box-Cox transfrom