/tools/cmake_call.sh file to remove warnings
with respect to stdout/stderr/fprintf etc in upstream C libraryUpdated build system to use cmake
Bug fixes: * Fixed the bug in assigning absolute tolerances
Bug fixes: * Fixed the linking problem due to multiple defined symbols
New features: * added the cvsolve function to solve ODEs
with multiple discontinuities
Bug fixes: * None
API change: * NONE is existing functions * A new function
cvsolve is added
Internal changes: * Now uses SUNDIALS version 5.2.0 (released March 2020) at the back end