Fixes #1. Now master builds on 32 and 64 bits
[fix] Build documentation even when library is not installed. Thanks to Samuel Thibault
[fix] Define default arguments in function declaration instead of in function definition. Thanks to Alexander.
[fix] printf and size_t do not work well together in C++-98. Use a workaround for portability
[fix] Be more pedantic
[build] Some autoconf tests were missing
[fix] Initialize all WQuestion members
[fix] Remove some memory leaks in esps i/o
[fix] Use EST_Filepos instead of long long int