sql_well: add_branch_gis() convert old-fashioned logs table to new format
sql_well: add_branch_gis() convert old-fashioned logs table to new format

Big logs table with > 2 columns and empty name (when user calls
add_branch_gis(wname, branch_name, g)) is split into sequence of
two-column tables with depth and log values for each column in source
table.
Now all well logs that are added via add_branch_gis() always converted
to new format.

bs-eagle/bs-eagle,bs-eagle/bs-eagle,bs-eagle/bs-eagle