CGX feature request: suppress re-framing at end of reading of batch files

[mkraska]

Request: Provide an option to suppress the automatic re-adjustment of the view when switching to interactive mode after reading command files.2

For an example, see issue #3 and compare the generated png file with the screen contents after readng the file.

Reason: Sometimes command files are used to adjust the view for a particular purpose. This can be spoiled by automatic re-adjustments.

Proposal: do not perform any adjustment, if reading the file was stopped by break (be it at the end or in the midst of a file).