2.5.10-rc1

• Add caching to the processing of substitution rules (Daniel).
• Fixes for inline execution of Python functions in maths expressions.
• Do not gobble normal output when an error occurs notebook execution.
• Fix inconsistent behaviour and crashes with split-view mode.
• Fix display of LaTeXForm properties.
• Documentation updates.
• Close LaTeX input cells on running them (configurable).
• Cleanup and document kernel options.
• Various additions to the plotting package cdb.graphics.plot including docs.
• Add preliminary support for Plotly as plotting backend.
• Word wrap LaTeX input cells to keep notebooks readable for any window width.
• Internal changes for python path handling.