Generalize array operations.
make dist and use pregenerated files
re-establish HyperDoc content from .htex sources
Remove executable property on src/algebra/mrv_limit.spad.pamphlet
Comment fix.
Add more operators.
Rename 'limitedint' to 'logint', etc.
Change default style of 3D graphics.
Better zero test during limit computation.
Change formula for derivatives of asec, asech, acsc and acsch.