Memory use of `scalapack_f_wrapper::factorize()`

Nobody has claimed this yet.

I'm currently playing with the [example 1](https://github.com/LLNL/libROM/blob/master/examples/prom/poisson_global_rom.cpp). Although, I'm having a memory limitation error at merge stage, which I think is somewhat strange:
```
test@3a4a682f99d7:~/build/examples/prom$ sudo ./poisson_global_rom -merge -ns 3
Options used:
--mesh ../data/star.mesh
--order 1
--id 0
--nset 3
--no-static-condensation
--no-partial-assembly
--frequency 1
--coefficient 1
--device cpu
--visit-datafiles
--visualization
--no-fom
--no-offline
--no-online
--merge
Device configuration: cpu
Memory configuration: host-std
Number of finite element unknowns: 82561
Opening file: basis0_snapshot.000000
Opening file: basis1_snapshot.000000
Opening file: basis2_snapshot.000000
Creating file: basis.000000
In file '/home/test/libROM/lib/linalg/scalapack_f_wrapper.f90', around line 525: Error allocating 13081962144 bytes: Cannot allocate memory
```

`In file '/home/test/libROM/lib/linalg/scalapack_f_wrapper.f90', around line 525` corresponds to the middle of `factorize()` function. It's demanding about 13GB of memory for SVD operation of matrix of size `(82561, 3)`, which probably takes about 2 MB of memory.

When I run this on a machine with a larger memory, it works as expected. Although, I'm wondering if this memory usage is an expected size.

Reproduce the merge command from examples/prom/poisson_global_rom.cpp and inspect lib/linalg/scalapack_f_wrapper.f90 around line 525 in factorize(). Compare the allocation with the reported (82561, 3) matrix dimensions and determine whether the 13 GB request is expected; document the explanation or identify the faulty allocation.

Written by the indexing model from the issue text.