[prakriya] Clean up various code

Changes include:
- Rename two `Prakriya` methods: `op` to `run` and `op_term` to `run_at`.
- Standardize on `CharPrakriya` when working with characters.
- Reduce use of `has_tag` in favor of methods like `has_abhyasa`.
- Simplify various testing functions for readability and ease of use.
- Add more docstrings and comments.
- Add other small fixes.

vidyut-prakriya/Cargo.toml

@@ -14,7 +14,7 @@ edition = "2021"
 clap = { version = "4.0.12", features = ["derive"] }
 compact_str = { version = "0.6.1", features = ["serde"] }
 csv = "1.1.6"
-enumset = { version = "1.0.12", features = ["serde"] }
+enumset = { version = "1.1.3", features = ["serde"] }
 lazy_static = "1.4.0"
 serde = { version = "1.0.150", features = ["derive"] }
 sha2 = "0.10.6"

vidyut-prakriya/Makefile

@@ -90,7 +90,7 @@ check_rule_coverage:
 # Profiles the program's execution time on OSX. This command will probably not
 # work on other operating systems.
 profile-time-osx:
-	cargo instruments -t time --release --bin create_test_files
+	cargo instruments -t time --release --bin create_test_file
 
 
 # Other

vidyut-prakriya/README.md

@@ -239,13 +239,13 @@ fn rules(p: &mut Prakriya, i: usize) -> Option<()> {
 
     if base.has_tag(T::Abhyasta) {
         // juhvati
-        p.op_term("7.1.4", i, op::adi("at"));
+        p.run_at("7.1.4", i, op::adi("at"));
     } else if !base.has_antya('a') && tin.has_tag(T::Atmanepada) {
         // kurvate
-        p.op_term("7.1.5", i, op::adi("at"));
+        p.run_at("7.1.5", i, op::adi("at"));
     } else {
         // Bavanti
-        p.op_term("7.1.3", i, op::adi("ant"));
+        p.run_at("7.1.3", i, op::adi("ant"));
     }
 
     Some(())
@@ -266,7 +266,7 @@ they don't sacrifice readability. Some notes on our naming conventions:
 
 Notes on our API:
 
-- `p.op_term("my-rule", i, fn)` applies the `fn` function to the term at index `i`
+- `p.run_at("my-rule", i, fn)` applies the `fn` function to the term at index `i`
   of `p` and associates that operation with `"my-rule"`.
 - `op::adi(s)` returns a function. The returned function accepts a `Term` and
   replaces its first sound with `s`. If you haven't worked with [first-class