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 This backend creates a bridge between Cantor and the Sage mathematical software.
 
 To accomplish this, it launches a sage session using KPtyProcess.
 It sends the input to the process, and tries to parse the output.
 (NOTE: KPtyProcess is used instead of a regular KProcess, because
 when using KProcess, some weird errors showed up. e.g. when running
 sage.misc.latex.pretty_print_default)
 
 The backend basically works by comparing the number of lines,
 fed to the process, and the number of prompts read from it to
 determine when a process is finished. To find out if a computation
 has returned an image(e.g. whe plotting) it monitors the tmp directory
 used by sage using KDirWatch, and returns an ImageResult if a new
 file was created there while the computation was in progress.
 
 Sage offers the pretty_print_default option to automatically return latex code
 for the results. This is used when Typesetting is enabled.
 
 TabCompletion is implemented by calling sage.interfaces.tab_completion.completions in the Session and parsing the
 output. To make sure it doesn't mess with the history, some tricks are used. (see the code)
 
 Highlighting uses a simple list of known keywords and some regular expressions. (so no magic here)