Fix Windows glpsol build: add defines via config.h instead of CFLAGS

Build glpsol for all platforms (macOS, Linux, Windows)

Fix glpsol macOS build: add -DNDEBUG to suppress false assertion

Added macos-15 arm64 glpsol executable

Fix glpsol path: static build puts binary at examples/glpsol directly

Build glpsol as static binary to include libglpk

Fix glpsol build: upload real binary from .libs/, skip make install

Fix glpsol build: use make install to get real binary, not libtool wrapper

Fix glpsol build: binary is in examples/, use macos-15

Fix glpsol build: repo has no glpk/ subdirectory

Add glpsol macOS build workflow

Merge branch 'master' of github.com:irena-flextool/flextool

Change nodeBalancePeriod to use pdtNodeInflow (sum over period) instead of annual_flow. Annual_flow is not supposed to have a sign.

Updated Flextool databases to the latest Spine DB API release

Checking that the timestep durations are positive and non-zero