increase line buffer size

[Michael-M-Baron]

The line buffer size is set to 64 * 1024 * 1024 = 64MiB per default. Japi-Requests with more bytes will fail and cause the error

ERROR: Maximum line size of 67108864 bytes exceeded!

However, for some applications like transferring data to the server increased line sizes would be needed. The line size can be adjusted with redefining CREADLINE_MAX_LINE_SIZE to the desired value.

[Michael-M-Baron]

I temporarily fixed the line size to 1GiB.

However, the line size is depending on the user application and should be somehow adjustable when including the library (With a setter function, with config files, etc.) and not by changing the source software.