SQuIDS version 1.2

This release contains a wide variety of bugfixes, cleanups, generalizations, and optimizations developed to benefit nuSQuIDS and other uses of SQuIDS. It should be noted that there are some backward-incompatible changes in naming in the library interface.

Changes since v1.1:

• Library names have been moved into the squids namespace
• Support for extraction of SU vectors and basis transformations to GSL matrices
• Implementation of matrix exponentiation for use cases like evolution with non-diagonalized Hamiltonians
• Implementation of a number of useful matrix operations on SU vectors, including applying arbitrary unitary transformations, extracting real and imaginary components, transposition, and generalized, weighted rotations
• Support for obtaining the eigensystem which diagonalizes an SU_vector
• Explicit disallowance of creating or manipulating SU(1) vectors, which are degenerate with scalars
• A fix to a severe issue in the use of the GSL ODE interface, now giving good output for much less stringent tolerance values
• Optimization of element-wise operations on SU vectors without the need to allocate temporary storage
• Redesign of SU vector operations for vectorizability, including optimized allocation of element storage with optimal alignment
• Implementation of a more efficient version of SU vector time evolution which can share initialization costs across multiple evolutions by the same operator over the same time interval
• A more precise definition of the meter
• Improvements to configuration and build system
• Clean up of capitalization for file and class names
• Rearrangement of project files to a more standard layout
• Elimination of memory leaks
• Limited support for the Intel and Portland Group compilers. These should not be considered guaranteed to work, but have been given minimal testing and appear compile the library correctly.
• Added additional unit converstions to SQuIDS constants