This adds an io-benchmark case of the STRING_LINE_READER
class, which reads a file into a std::string, *then*
reads it line by line.
As expected, due to it all being in memory, this is very fast.
Also fixes an issue in io_benchmark where the input file
must be in the current dir.
This compares the performance of RICHIO line readers against other
implementations, and can be used for profiling and optimisation.
Current benchmarks provided:
* richio FILE_LINE_READER
* Raw std::ifstream (no LINE_READER wrapper), using getline (so no line
length limiting)
* LINE_READER wrapper around std::istream, with a std::ifstream
implementation
* Existing richio wxInputStream wrappers (with File and FFile
implemntations)
John Beard
Simon Richter