Fix printing log function for numeric solver expressions

[pnbabu]

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[github-actions]

Bencher Report

Branch	1250/merge
Testbed	ubuntu-latest

🚨 1 Alert

Iteration	Benchmark	Measure Units	View	Benchmark Result (Result Δ%)	Upper Boundary (Limit %)
0	tests/nest_continuous_benchmarking/test_nest_continuous_benchmarking.py::TestNESTContinuousBenchmarking::test_stdp_nn_synapse	Latency seconds (s)	📈 plot 🚷 threshold 🚨 alert (🔔)	3.80 s (+11.13%) Baseline: 3.42 s	3.77 s (101.03%)

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Benchmark	Latency	Benchmark Result seconds (s) (Result Δ%)	Upper Boundary seconds (s) (Limit %)
tests/nest_continuous_benchmarking/test_nest_continuous_benchmarking.py::TestNESTContinuousBenchmarking::test_stdp_nn_synapse	📈 view plot 🚷 view threshold 🚨 view alert (🔔)	3.80 s (+11.13%) Baseline: 3.42 s	3.77 s (101.03%)

Benchmark	Latency	Benchmark Result seconds (s) (Result Δ%)	Upper Boundary seconds (s) (Limit %)
tests/nest_continuous_benchmarking/test_nest_continuous_benchmarking.py::TestNESTContinuousBenchmarking::test_stdp_nn_synapse	📈 view plot 🚷 view threshold 🚨 view alert (🔔)	3.21 s (-6.09%) Baseline: 3.41 s	3.76 s (85.37%)

Benchmark	Latency	Benchmark Result seconds (s) (Result Δ%)	Upper Boundary seconds (s) (Limit %)
tests/nest_continuous_benchmarking/test_nest_continuous_benchmarking.py::TestNESTContinuousBenchmarking::test_stdp_nn_synapse	📈 view plot 🚷 view threshold 🚨 view alert (🔔)	3.20 s (-6.23%) Baseline: 3.42 s	3.76 s (85.25%)

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[clinssen]

Either log10 or ln should be used to avoid ambiguities about the base (see https://nestml.readthedocs.io/en/latest/nestml_language/nestml_language_concepts.html#predefined-functions). Does using log in a NESTML model (without a custom NESTML model function log being defined) not result in an error?