Create doc ST_ToMultiPoint
Update doc of ST_ToMakePoint
Create doc and image of ST_ToMultiPoint
Update ST_ToMultipoint
Create doc and image of ST_ToMultiSegments
Update ST_ToMultiSegments
Update ST_ToMultiSegments
Update description for ST_ToMultiPoint
Update images of ST_ToMultiPoint
Update images of ST_ToMultiSegments
Merge remote-tracking branch 'mireille/st_tomultipoint' into m-112
Update image case3 for ST_ToMultiSegments
Merge remote-tracking branch 'mireille/st_tomultisegment' into m-112
Improve convert functions (ext)

@gpetit @mlecoeuvre Please see these corrections.
Merge branch 'm-112' into gh-pages

157 Create doc and image of ST_ToMultiPoint
158 Add description and images for ST_ToMultiSegments