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