topo: use local cpt files before loading included cpts
cake: more general merging of crustal and global models
gf: fixed a problem with distance computations on discretized sources
gmtpy: fixed a bug in layout calculations
automap: configurable plot margins
automap: configurable axes layout
automap: configurable cpts for topography
Merge branch 'master' of github.com:emolch/pyrocko