Squashed 'cgilite/' changes from 970afda..9e5394e

Squashed 'cgilite/' changes from 970afda..9e5394e

9e5394e typo
a004238 do not require class=search for input of type=search
fb015c8 allow link/image src pattern with whitespace, avoid confusion with comment
1e12e80 force ALT-text for images
41642aa link and image syntax allowing whitespace URLs, repace use of non-posix gensub()
31cfd89 change order of precedence (HTML binds more than link brackets)
880ed14 css: avoid search button overflow, always center h1
211f2ee export _DATE variable
b846014 bugfix: recognize center and left aligned pipe tables
8928c6e independent macro extension
4c361b1 allow bullet symbol as list marker (for copy/paste from office documents)
4ee910d bugfix: do not accidentally start list blocks at second order
8e5ffff bugfix: do not consume multiple paragraphs in list start
3055b17 LICENSE CHANGE: CGIlite is now under ISC License!
d4da2a5 bugfix: endless loop in _startlist because of lacking indention removal
fc3451c discriminate between different list markers
8822843 unified list code
8e79399 allow block lists (again)
cc08744 reduce use of non-posix gensub
3d2d975 simpler block nesting, fix: h2 after paragraph
ca22f37 fix: block nesting in lists
1f4a5e2 fix: task list unsure
fc47d5d improved lists
0d64190 style for definition lists, adjusted list padding
0c5f738 style for line-block
887a68a tidy up variable declarations, remove additional line break after headline
ae55f6f introducing definition lists!
1cf0dab markdown: avoid adding newlines to blockquote, css: style for blockquote
854547d headline atttributes
b4a3f6a heading text in id
33570b0 block level prefix to avoid repeating headline IDs
516bc32 nesting of <section> in block elements
925f042 unified headline function
9b2f590 bugfix do not escape # character in link references
d45722a Omit link IDs in nested headings, to prevent ambiguous IDs
e6442fb EXPERIMENTAL: <section> wrapping for Headlines
d0b1c70 bugfix: HEX_DECODE for prefixes looking like shell patterns
8ce6dce bugfix: do not accidentally strip white spaces from code spans
c4ba9cc Include backtick (`) in URL escape handling
d61539c bugfix: prevent endless loop in HEX_DECODE, copy non-hex-digits unchanged
8fd595c translatable user dialogs
30435ff list padding, to prevent bullets floating into elements to the left
628929d Security: put backslash-escaped characters through HTML escaping
2ea88f7 Compatibility: Grid Tables section now compatible with posix/busybox awk
0f8f663 performance: avoid process forking
d45e2c8 wiki style links: portability regex fix
fa6be3f Allow headerless grid tables
f9f5356 allow empty alt text in images
019a9ea Extension: Arrows
01dadd7 enable block element Macros
697a1bb extesion: introduce <figure>-wrapped images as block elements
a8a5ea5 bugfix: enable image links
ffe17ca W3C Validator compliance: introduce separate function for escaping URL references, omit superfluous trailing slashes (e.g. in <br />)

git-subtree-dir: cgilite
git-subtree-split: 9e5394e58e45e0601cd41976bd5e5c865cfba008