Introduced a buffer in SectionReader::readInstanceNumber() to fasten lazy loading
Buffered a read to increase speed in Lazy Loading

Added a buffer in SectionReader::readInstanceNumber(). This leads to 1.5x speedup of lazy loading on a 32-bit System. Also Adhered to comments pointed out in the previous commit.
Updated error message

The error message on finding a very large instance ID is saner
Added std::endl to the warning message
Corrected a Malformed comment
Safer String to Integer conversion.

Accurate inference of number of characters in the string representation of the instance number. On finding a very large instance number, lazyloading will skip that section.