Improve evaluations, matrix copies and add new features for PDEs and integration

[hverhelst]

NEW:

• Sparse matrices
• Function expressions
• Quadrature rules
• Compute function
• Element getters

API:

• evalSingle/derivSingle/deriv2Single --> eval/deriv/deriv2
• remove Gismo.size and replace by Base.size (works)
• Remove asMatrix and toMatrix and add copyMatrix since there were issues in garbage collection

FIXED:

• gismo_jll version

[Albe21072000]

For me it is all OK, the only issue is with the plot visualization in VScode, which requires the method display instead of gui.

[Copilot]

Pull Request Overview

This PR updates the single‐basis evaluation API, unifies size implementations, and refactors matrix I/O/ownership semantics while adding sparse‐matrix and PDE support.

• Renamed evalSingle/derivSingle/deriv2Single to val/deriv/deriv2 and routed through new compute API
• Replaced custom Gismo.size with Base.size on Basis, KnotVector, MultiPatch, etc.
• Refactored matrix functions (asMatrix→copyMatrix, asVector→copyVector) and introduced sparse‐matrix exports and new PDE & FunctionExpr types

Reviewed Changes

Copilot reviewed 16 out of 20 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test/runtests.jl	Switched to size, added val/deriv/deriv2 tests, sparse support
src/gsCore.jl	Replaced evalSingle fns, updated Base.size, added compute, getElements, boundary, boundaryOffset
src/gsMatrix.jl	Renamed ownership wrappers to copyMatrix/copyVector, added sparse‐matrix support
src/gsHSplines.jl	Added tensorLevel, getLevelAtPoint, getElementData
src/gsPde.jl	Introduced BoundaryConditions, addCondition!, addCornerValue!, setGeoMap!
src/gsNurbs.jl	Updated size for KnotVector, pipe API for NurbsAnnulus
src/Declarations.jl	Declared new C‐pointer structs (gsCVectorInt, gsCSparseMatrix, gsCFunctionExpr, gsCBoundaryConditions)
src/Gismo.jl	Included new gsPde.jl submodule
test/runbenchmarks.jl	Removed unused import of Gismo.size
examples/*.jl	Updated example calls to use copyMatrix/copyVector and new APIs