pw.x-input Zoo, convert between different pw.x input (including ibrav!=0 ⇄ ibrav=0)

Cell setting
ibrav=0 CELL_PARAMETERS( alat ) celldm(1)
A
CELL_PARAMETERS( bohr )
CELL_PARAMETERS( angstrom )
ibrav≠0 celldm(1:6)
A,B,C,cosAB,cosAC,cosBC
Atomic position setting ATOMIC_POSITIONS (alat)
ATOMIC_POSITIONS (bohr)
ATOMIC_POSITIONS (angstrom)
ATOMIC_POSITIONS (crystal)
Note behind:
1. When specifying CELL_PARAMETERS, v1, v2, v3 should follow the form in INPUT_PW, to get correct ibrav.
2. alat is set to keep the norm of the first line of CELL_PARAMETES to be equal to 1.0.