utils: add E, Z, Y suffixes to ParseSize

Also, change the way we parse the size.
Sscanf was unhappy about parsing numbers
followed with an E suffix, because it
thinks it's part of scientific notation.
Merge pull request #97 from axw/utils-size-moarsuffix

utils: add E, Z, Y suffixes to ParseSize
Specified platform-specific system error message regexes
Merge pull request #93 from aznashwan/system-errors

Grouped platform-specific system error message regex-es.