Improve SRF plotting scripts to handle long thin ruptures

[fabiolsilva]

The current SRF plotting scripts on the BBP cannot handle long thin ruptures very well. The resulting plots are often just a black band that provides very little useful information.

In addition to using portrait mode, for ruptures that have an elongated aspect ratio, consider dividing the the rupture into segments and plotting multiple segments separately on the same page one above the other.