gridmicrotex 0.2.0

• LaTeX is read by a new, faster parser that follows TeX's rules, so macros, environments and starred forms work as in LaTeX, and malformed input is drawn with a warning giving its line:col instead of failing. As in TeX, a space after a command is dropped (write \LaTeX{} is), and _, ^, # and & outside math warn.
• New input_mode = "document" renders a LaTeX document body, or a whole pasted paper, wrapped at max_width (see vignette("documents")). Markdown is now laid out the same way, so its paragraphs, styled spans and tables stay within their box.
• New latex_options(device_math = TRUE) renders $…$ math in base graphics labels.
• New load_font() names a font file or an installed family, with its bold and italic files, and available_fonts() lists them. latex_options() takes main_font, sans_font and mono_font, the fonts of the body, \textsf and \texttt. load_math_font(), available_math_fonts() and check_math_fonts() are superseded by load_font() and available_fonts(); they still work.
• Text in a font given to load_font() is measured and drawn from the font file, so it looks the same on every device, base pdf() included, where a font file never worked before. Other families are still the device's.
• An image that cannot be drawn is now an error saying why, figures load about ten times faster, and many bugs are fixed.