[#89] Added float type
[#89] Added float to SQL test
[#89] Added multiplication for floats
[#89] EagleDbSqlBinaryExpression_GetOperation() now works much better
[#89] Set types for page operations and made sqrt() float
[#89] Code coverage for core
[#89] Finsihed coverage
[#89] No leaks
[#89] Added some unary operators
[#89] Added operator tests
[#89] Code coverage tests
[#89] Docs
fixes #89