sync files from diff.git 9343b92549173e00690f24756a633423770f56d7

make gotwebd start up without a config file ok tracey

revert previous commit to sync with diff.git changes; it broke the build ../lib/blame.c:344:11: error: implicit declaration of function 'diff_atom_hash_update'

sync files from diff.git f400825bc668466d9fc593470514d6e69ddfc5ff

sync files from diff.git cd9ef01a441e0ecfd499bf907c15a2878f7e0ee2

locate_hunk: set mangled earlier for clarity suggested by stsp@; no functional change.

patch regress: unify some tests

allow for ignore whitespaces when matching the hunk

gotwebd: avoid large allocation per fcgi record while here also wrap fcgi_send_response to make sure we don't end up trying to send a fcgi record bigger than allowed. ok tracey@

sync files from diff.git 3a15e1807a369c0a7827363eca22c9f1a8598d9c Rather than realloc in fixed-sized blocks, use the 1.5 * allocated scheme when growing the array. This produces fewer allocations and up to 3x speedup on large diffs. ok stsp@

tog: add n{G,g} key map to jump to line n like less(1) Available to all views; for example, 99g will navigate to line 99 in the file if in a blame view or the 99th commit if in a log view. Includes improvements suggested by naddy and stsp. ok naddy@

remove a tog blame TODO item which has been implemented

remove 'author' TODO items; these have been implemented

add two more TODO items

move use of sin_len out of gotwebd's parse.y ok tracey

rework got patch -c documentation ok op@

remove pointless repo_close with leaked error; found by florian with scan-build

fix two missing error checks in tog; found by florian with scan-build

tweak op@ log_debug output

fix logging of fcgi_send_response as originally intended by tracey@

gotwebd: handle partial writes fcgi_send_response can end up trying to send big amount of data, in particular when serving blobs. if a write failure occurs, gotwebd and httpd go out of sync and "bad stuff happens". debugged with and ok tracey@

gotwebd: simplify got_output_file_blob loop there's no need to distinguish between plain text blob and a binary one in the output, just send it chunk by chunk. ok tracey@

gotwebd: simplify isbinary

implement fcgi_gen_response on top of fcgi_gen_binary_response ok tracey@

gotwebd: fix double Content-Type (and the typo) ok tracey@