rename \includedot -> \includedotsvg and \includedottex -> \includedot

and also clarify that \includesvg uses inkscape
if dot2texi is loaded, then define \animatedot
rewrite \slideshow to accept keyword args

borrow some padding with zeros from package animate

fix bug introduced by 6802d82f42336486a0ec6b50bbf7c218a6f8e021
because counting for files should be independent from the slide count, which must start at 1.
bugfix: \multincludegraphics is designed to handle undefined width

so don't define a default value for width
define \Break, Continue for algpseudocode