add buffering for I/O operations for kmers.txt

[sebhtml]

use this

bool flushFileOperationBuffer(bool force,ostringstream_buffer,ostream_file,int bufferSize){

or this

bool flushFileOperationBuffer_FILE(bool force,ostringstream_buffer,FILE_file,int bufferSize){

(from code/Mock/common_functions.cpp )

[sebhtml]

this option must be added too:

-write-kmers Writes k-mer graph to RayOutput/kmers.txt The resulting file is not utilised by Ray. The resulting file is very large.

[jferdelyi]

[djeef@r109-n16 ~]$ sort kmers.txt | sha1sum 56f28e70b17109976c6ce09be002fabe4ec59a1b - [djeef@r109-n16 ~]$ sort kmers.txt.old | sha1sum 56f28e70b17109976c6ce09be002fabe4ec59a1b -

383914570531a24dcc0c3f07ebf30cd71e5c6f98