Qlazy

- refactoring(c): qstate.c
- add function(py): DensOp - reset
- add example(py): error correction (hamming code)
- change name(c): libQlazy.so -> libqlz.so

- add function(py): DensOp - bit_flip, phase_flip, bit_phase_flip, depolarize, amp_dump, phase_dump
- change spec(py): DensOp - __new__ ('qubit_num' option -> create |00..0><00..0|)
- add example(py): error correction (shor code)

- change spec(py): QState - m,mx,my,mz,mb (add 'tag' option)
- change spec(py): QState - m_freq, m_value, m_bit, m_is_zero, m_is_one (refer to 'tag')
- change spec(py): all measurement methods (default 'shots' value changed 100 -> 1)
- add function(py): QState - reset (reset quantum state |i> to |0>)
- add function(py): QState - free_all
- add function(py): DensOp - free_all
- change spec(py): QState - argument name 'id' changed to 'qid'
- change spec(py): DensOp - argument name 'id' changed to 'qid'
- change spec(py): QState - inpro, fidelity (for partial system)
- change spec(py): DensOp - distance, fidelity (for partial system)
- correct example(py): hadamard test

- unittest
- change spec(py): QState - mcx
- change spec(py): DensOp - mcx
- change directories of examples(py): structures and 'test.sh'
- correct exapmple(py): hadamard test
- correct exapmple(py): purification
- add function(py): QState - partial (extract partial quantum state)
- bug fix(py): DensOp - relative_entropy
- bug fix(py): rx

- add function(py): QState - add_method (add custom gate)
- add function(py): QState - create_register
- add function(py): QState - init_register
- add function(py): QState - mcx (multi-controlled X gate)
- add function(py): QState - fidelity (abs. value of the inner product)
- add function(py): QState - composite (make composite quantum state)
- add function(py): DensOp - composite (make composite density operator)
- add function(py): MData - __str__ (print MData instance)
- change spec(py): DensOp - __init__ (set equal prob., if 'prob' is not specified)
- add example(py): quantum state tomograpy
- add example(py): data compression (shannon)
- add example(py): data compression (schumacher)
- bug fix(c): interactive mode ('segmentation fault' issue of 'init 0')
- bug fix(c): densop_copy

- add function(c/py): gate operation for densop
- add function(c/py): tensor product for densop
- bug fix(c/py): cu1,cu2,cu3,densop_init