Load step operations

These SOLUTION commands are used to write and solve multiple load steps.

Mapdl.lsclear([lab])	Clears loads and load step options from the database.
Mapdl.lsdele([lsmin, lsmax, lsinc])	Deletes load step files.
Mapdl.lsread([lsnum])	Reads load and load step option data into the database.
Mapdl.lssolve([lsmin, lsmax, lsinc])	Reads and solves multiple load steps.
Mapdl.lswrite([lsnum])	Writes load and load step option data to a file.