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@

warn about the interaction between got patch -p and -c suggested by stsp@

got patch: add -c flag to apply at a specified commit it's useful for e.g. to apply old patches that weren't generated by `got diff' or git-diff(1) and so lacks the metadata needed for the 3-way merge. manpage improvements from and ok stsp@

simplify got_patch/apply_patch to call reverse_patch in one place once Current code is overly complex; it looks if the diff *might* use diff3 merge to postpone reverse_patch until we know for sure. Instead, just reverse_patch in apply_patch once we know if merge *is* used or not.

add a simple test for 'got diff' against CRLF files

sync files from diff.git ed9312f04bcebc7aee4f7e7d96d6ec467cb9bb66

`got patch' pledge early ok stsp@

got patch: error if patchfile isn't a regular file `got patch' cannot read patches from non-regular files for obvious reasons. However, it could crash in sendmsg because pledge doesn't allow to send file descriptors referring to directories. So, restrict `got patch' to operate on regular files only and fail otherwise. This still allows to read patches from symlinks since they're resolved at open(2) time and the file type check is performed after. There may be a marginal usefullness in reading patches from fifos, but the current code doesn't allow that anyway since got-read-patch needs a seekable file descriptor anyway. ok tracey@

fix off_t type mismatches off_t is a signed type and depending on the platform, it can be "long" or "long long", so cast to long long for printf(). ok stsp