- add missing `.fi` tags.
- fix misplaced `.nf` tags.
- add `.nf`/`.fi` tags `SYNOPSIS` where missing.
- fix missing/wrong function name from `SH NAME`.
- fix wrong function name in `TH`.
- keep return values in a separate line.
- indent.
- fold long lines.
- deleted `libssh2_channel_direct_streamlocal()`, there is no such function.
- add missing types.
- add missing headers.
Closes#949
The previously existing libssh2_scp_send_ex() function has no way
to send files that are larger than 'size_t' which on 32bit
systems mean 4GB. This new API uses a libssh2_int64_t type and
should thus on most modern systems be able to send enormous
files.