Use or discard commented-out tests from R3-Alpha driver

[hostilefork]

The following was in the original code. It was hanging around in comments, and has been deleted and moved here for review.

a: b: c: 0
dt [loop 512 [
    cache: open odbc://cachesamples
    a: a + 1
    close cache
    b: b + 1
]]

a: b: c: 0
dt [loop 512 [
    cache: open odbc://cachesamples
    a: a + 1
    db: first cache
    b: b + 1
    close cache
    c: c + 1
]]

dbs: []
a: 0
dt [
    cache: open odbc://cachesamples
    loop 512 [append dbs first cache | a: a + 1]
    close cache
]

a: b: c: 0
dt [loop 512 [
    postgresql: open odbc://pgsamples
    a: a + 1
    close postgresql
    b: b + 1
]]

a: b: c: 0
dt [loop 512 [
    postgresql: open odbc://pgsamples
    a: a + 1
    db: first postgresql
    b: b + 1
    close postgresql
    c: c + 1
]]